Fig. 1

Loading and unloading operation mode of double container yard crane with single-lift structure

Table 1

Classification of operation characteristics in mixed stack container area

Fig. 2

Chromosome coding of single-container yard crane scheduling model

Fig. 3

Chromosome coding of twin 40 ft yard crane with single-lift structure scheduling model

Fig. 4

Chromosome coding of twin 40 ft yard crane with twin-lift structure scheduling model

Fig. 5

Crossover operation

Fig. 6

Mutation operation

Fig. 7

Solving process of simulate anneal genetic algorithm

Fig. 8

Solving process of improved genetic algorithm

Table 2

Task information during experimental planning period

Fig. 9

GA iterative optimization process of single-container yard crane

Fig. 10

SAGA iterative optimization process of single-container yard crane

Fig. 11

GA iterative optimization process of twin 40 ft yard crane with singe-lift structure

Fig. 12

SAGA iterative optimization process of twin 40 ft yard crane with singe-lift structure

Fig. 13

GA iterative optimization process of twin 40 feet yard crane with twin-lift structure

Fig. 14

SAGA iterative optimization process of twin 40 ft yard crane with twin-lift structure

Table 3

Experimental results of different adjacent box tasks

Table 4

Experimental results of different tasks

Table 5

Experimental results on the number of different shell positions

Fig. 15

Comparison of the results of different adjacent boxes

Fig. 16

Comparison of the results of different tasks

Fig. 17

Comparison of the results of different shell positions